Evaporating apparatus.



H. KAYSER.

EVAPORATING APPARATUS.

APPLICATION FILED JULY 28, 1911.

2 SHEETSSHEET 1.

Patented Aug. 27, 1912.

@ wzgnz ki H. KAYSBR. EVAPORATING APPARATUS.

APPLICATION FILED JULY 28, 1911. L036,63?Z

2 SHEETS-SHEET'Z.

' W- Z I m r I ll V Patented Aug. 27, 1912. v

i but a slight pressure under that prevailing thence through the various vessels and the in the direction of the arrows.

tween t Hans ansas, or'nunnmnnnc, (manner.

- nvarona'rmo AIPABATUS.

Spectfieatipn'ot Letters Iatent. Pat ented'Allg. 27, 1912 Application filed July 88, 1911. Serial No. 841,116.

To all whom it may concern: 1 Be it known that L'HANs Karena, a citi- 'zen of the Empire of Germany, residing at.- Nuremberg, in the Empire ot-Germany, have invented a new and useful Evaporating Apparatus, of which the following is. a specification.

Myinvention consists oi an evaporating apparatus for carrying into effect most diversified processes of thickening or concentrating solutions by evaporation, or of dry ing materials, in which a Honigmanns brine, that is a mixture of a solution of caustic soda (NaOH) and of a solution of calcium chlorid (02101 is employed as a heating medium. Thereby the advantage is obtained, that the'heating brine possesses in the evaporating or drying space. In -c nsequence of, this the apparatus does not re quire any complicated strengthening means, such as stays, rivets, and the like, so that it can be constructed in a simple and cheap manner.

According to my invention the apparatus consists of a casing composed of superposed sections, a number of flat .low closed vessels so superposed in the casing, as to leave heem a serpentine channel rising from bottom to top, and a number of scrapers, one for each vessel and sweept ing its top surface and means for transversely reciprocating the scrapers. The Honigmann brine is supplied through a tube to the uppermost vessel and passes from tubes connecting them together downward, while absorbing the vapor or steam arising from the liquid or material on the vessels and-at the same time liberating heat, which in turn is utilized for further evaporating the liquid or drying the material.

I will now proceed to describe my invention with reference 'to the accompanying drawings in which Figure 1 represents a vertical longitudinal section through an evaporating apparatus. Fig. 2 illustrates on an enlarged scale, in section on line B-C of Fig. 1, part of the apparatus, and Fig. 3 is a cross section on line D-E of Fig. 1, both figures to be seen A denotes a casing, which is shown to he disposed, one atthe hi of rectangular cross section, a bottom A: and

a to l. The sections i i have flanges y' j, whic can'be bolted together. Each section yi is shown to contain two superposed opposltely inclined flat closed vessels m m, which may be supposed to extend over the whole width of the section 1; and reach fromone side wall to apoint near the opposite side well. They may be fastened tothe walls'of the section 2' in any known manner and leave between them a serpentine channel rising trom the bottom is to the top 1., Each yessel'm is shown to be composed of a frame from U-iron and two platesforming respectively the bottom and thetop. 'Within the vesselm three perforated itubes ab 0 are 'her end, another at the lower end and the third near the second,

and all these tubes extend over the whole width of the vessel. The lower tube 0' of the uppermost vessel m may be connected with a tube-n leading to some source of heated Honigmann brine. Theupper tube a of. each vessel (excepting the lowest) is shown to be connected by means of a tube 0 on the outside of the sectioni with the lower tube ,0 of the next lower vessel m.- The uppertube a .of the lowest vessel m may be connected .with a tube 7) leading to some boiler or the like. The tube 1) of each vessel m communicates with an upright tube b, which projects .firom the vessel near one wall and is open at the upper end. The perforations of the tubes at b 0 are preferably-made fine, and their number should be large.- The plates forming the tops ofthe six upper vessels 00 m m are shown to be bent at thelower end upward so as to form a trough q, in which any liquid is kept, so that its level extends to the upper end of thetop of the vessel. A eonveyer f of any known construction is mounted to'turn in the trough 9, its. shaft passing through suitable stufling-boxes (not shown) in the walls of the sectioni and being arranged to be driven from without in any known manner 'The conveyer f is adapted to convey any precipitate through t 9 some opening (not shown) to a tube on outside of the section i. o

The bottom k is shown to be made in one' with a trough r, in which (5 conveyer 7'; is disposed. The trou h r serves for collecting all precipitates or odies dropping off the lower vessels m m and thecninveyer' h is adapted to transport the collected precipitates or bodies from the casing A to without.

The top connected with a supply tube 9 for the material to-be freed from liquid or dried. I

Two tubes d d anemouutedinsuitable stufiingboxes (not shown) in the walls of each section 2' to longitudinally reciprocate.

They may be assumed-to be connected by of the vessel A, and the cranks may be asconnecting rods-with cranks on the outside sumed .to :be' connected with gear wheels which mesh together and can be driven-from without in any known manner. Each reciprocatlng tube (Z is rigidly connected with a 4 scraper e of any known constructiom'which is adapted to sweep nearly the whole width of the top of the vessel m without striking the rivet heads along the edges of the vessel. In general a wedge-shaped space may be i: left above the levelof the brine in any vessel m at its upper end andfilledup with I gases or vapors which can not be absorbed y the brine. For this reason preferably theupper-end of each vessel m is connected with a small tube (not shown) leading through the wall of the section 1'' into the ambient air. I l

The eva crating apparatus descr bed op- V crates as ollows: Thesolution to be concentrated or the pulp to be dried by evaporation or any material to be dried is introduced into the apparatus through the tube,

9 at the top, and the respective gear is-started for reciprocating the tubes at d with the scrapers e 6, also the various conveyers f f h are set to operate. The heated 'Honigmann brine in its concentrated state is supplied from the source through the tube 12, in the direction of the arrow, to the uppermost vessel m and heats the liquid, pulp or other material above the top of this vessel. The va-- por or steam developed from this liquid rises and passes in the direction of the ar-j' row through the upright tube b and the perforated tube b into the brine, where it is absorbed, so that the brine is a little diluted. -After-its passage upward the'some'. what diluted brine escapes from the vessel m through'the perforated tube a and passes through the tube 0 to the next lowerve'ssel m, where it passes from the perforations of the tube 0 upward while heating the liquid,

pulp or other material on the vesselm andeing further diluted 'by the absorption of the vapor or steam entering the vessel on i p quence of thisthe brine requires to be COD: centrated by evaporation in any known manner, before'it can again be supplied to the apparatus for repeating its circulation. For example the brine'may be concentrated in a known apparatus with several consecm tive boilers or in an apparatus heated b ex haust-steam, in which case frequent y a 7 great saving in combustibles may be. made.

The liquidladmitted to the apparatus through the tube 9 is gradually concentrated during its passage over the several superposed vessels mom, it flowing over the upper edge of the trough g from one vessel in the dlrectio'n of the arrow to the next .lower vessel, or over the loweredg'e of the flat top of one vessel direct to the. top of the next lower vessel. The constantl recipro eating scrapers e e will scrape 0 "any precipitate that may be. formed,' and thus keep clean the top surfaces of the vesselsm-m,

will be maintained at its maximum. The precipitates constantly turned over and if necessary scraped ofitby the scr'a ers '-e e will by reason of the inclination o thetop of each vessel gradually move downward so that the evaporating power of the latter into the reachuof the respective conveyei' f, which willremove the precipitates 'fromthe troughg to without' sdthattheycan be collected and further-treated or disposed of, as the case may :The liquid flowing over the upper edge of the lowest troughg will henceforward flow in a thin '18. er over the l top surfaces of the lower vesse m m and thus be subjected tolthe energetic heating action of the vessels,-,whereby its. concentration is accelerated; All 'precipitates orbodies, such as .sa1ts',,- impurities; or the-like, that may be formed .by theg evaporation, scraped off and over in bothdirectime b' the scraperszerauwiltsucoessively move own the-several-ve'esels m m, until they arrive'in thetrouglr r, frornwhence they willbe, movedto without by the conveyer h for further treatment or storage, as

disease maybe. The vapor or steam not.-

absorbed bythe brine in any vessel mwill move upward to the space at the higher end of the vessel from which'space it can readily escape through thesaid small tube to without. This arrangement is permissible, since the overpressure within the apparatus does not amount to more than from half ameter to two meters water column. 1 Of course, where so preferred, any vacuum or any other overpressure may be producedin the apparatus, but it is in all cases referable to work the apparatusunder ,a slight overpressure,

since the apparatus can then be made simple and consequently chea The said overpressure is utilized for orcing the vapor or steam separated from the liquid, pulp or other material through the upright tubes 6 bf and the perforated tubes b. into the Honigmann brine. Of course the casin A must be capable o1 withstanding the said overpressure.

The chief advantage of the new apparatus resides in the fact, that the Honigmann brine in the vessels at m does not possess any noticeable pressure over that prevailing in the spaceiwithin the casing A between the seveal vessels in m, so that leakages of these vesselsare nearly excluded and the vessels do not require any strengthening means, such as stays, rivets, and the like. The upper plate of each vessel in is riveted only along the edges, but otherwise per fectly smooth, so that the scrapers 6 can notpossibly render untightany rivet or anglejoin-t.

The new apparatus is suitable for all strongly incrusting liquids, such as brine,

sulfates, lyes, muddy liquids such as 0btained in chemical industries, etc., where the incru'stations are frequently obtained as valuable byproducts, further for all liquids which strongly foam and require to be quickly concentrated in thin layers, such as for example milk, further for drying up bodies and materials of all kinds, such as parings of suganheets, potatoes, distillers wash, spent malt, :l'ecal substances, .clarifier mud, browircoal, peat, brown-coal briquet pulp, etc.

The described apparatus is for example useful for the production of coarse kitchensalt from brine. Hitherto the coarsekitchensalt has been obtained exclusively by means of salt-pans, since the known vacuumapparatus with several consecutive boilers invariably furnish quite fine kitchen-salt. The

theory generally adopted was, that for the production of coarse kitchen-salt a nearly complete rest of the brine during its concentration be necessary. With the new apparatus it is quite permissible for the brine to boil on the several vessels, since the small crystals formed on the upper vessels are with the aid of the scrapers enabled to gradually grow duringtheir downward passage over the lower vessels. By adjusting the speed of the scrapers and conveyers it is possible to vary at will the size of the crys tals obtained TIOH'I all kinds of brines. The salts produced by the new apparatus are remzlirkable for the uniformity of their crysta 5.

tected against loss of heat, and the heat lost i. orously does the steam enter the heating yes sels and the greater is the yield of the apparatus. The steam inlet \alve thus serves simultaneously for regulating the yield of the apparatus.

The evaporating apparatus can be varied in many respects without departing from the spirit of my invention.

I claim:

1. In an evaporating apparatus, the combination with a casing, of low closed vessels superposed in said casing and leaving be tween them a serpentine channel rising from bottom to top, means for supplying the material to be freed from liquid or dried to the top of said casing, scrapers adapted to reciprocate'in the transverse direction over said vessels and to sweep oil in the longitudinal direction any precipitate or body, means for reciprocating said scrapers, means for supplying a heating medium to the uppermost of said vessels, tubes so connecting said vessels as to cause the heating medium to pass downward through the several vessels, means for discharging the heating medium from the lowest of said vessels, and means for discharging the material dropping oil the lowest vessel from said casing.

2. In an evaporating apparatus, the combination with a casing, of low closed vessels alternately inclined in opposite directions and superposed in said casing while leaving between them a serpentine channel rising from bottom to top, means "for supplying the material to be freed from liquid or dried to the top of said casing, scrapers adapted to reciprocate in the transverse direction over said vessels and to sweep off in the longituv dinal direction any precipitate or body, means for reciprocating said scrapers, means for supplying a heating medium to the uppermost of said vessels, tubes soconnecting said vessels as to cause the heating medium to pass downward through the several vessels, means for discharging the lieuting medium from the lowest of said vessels, and means for discharging the material dropping oil the lowest vessel from said casmg. g

3. In an evaporating apparatus, the coinbination with a casing, of low closed vessels superposed in said casing and leaving between them a serpentine channel rising from bottom to top, perforated tubes in said vessols, open upright tubes on said vessels communicating with said perforated tubes, means for supplying the material to be freed from liquid or dried to the top of said casing, scrapers adapted to reciprocate in the transverse direction over said vessels and to sweep off in the longitudinal direction any precipitate or body, means for reciprocating sai heat said vessels and to absorb through said upright tubes and said perforated tubes the scrapers, means for supplying to they uppermost of said vessels a brine adapted to bination with a casing, of low vessels each consisting of a frame and two plane plates riveted to the top and bottom side of the frame, said low vessels being alternately inclined in opposite directions and superposed in said casing while leaving between them a serpentine channel rising from bottom to top, means for supplying the material to be freed from liquid or dried to the top of said casing, scrapers adapted to reciprocate in the transverse direction over said vessels and to. sweep oii in the longitudinal direction any precipitate or body, means for reciprocating said scrapers, perforated tubes in said vessels, open upright tubes on saidvessels communicating with said perforated tubes, means for supplying to the, uppermost of said vessels a brine adapted to heat said vessels and to absorb through/said upright tubes and said perforated tubes the vapor or steam separated from the material, tubes so connecting said vessels as to cause the brine to pass downward through the several ves sels, means for dischar ing the diluted brine from the lowest of said vessels, and means for discharging the material dropping oil the lowest vessel from said casing.

or steam separated from the material,

insane? 5. Teen evaporating apparatus,

consisting of a frameandtwoplane (plates riveted to the top and bottom sideotth frame, said low vessels beingalternately, inclined in opposite directions and superposed in said casing while-leaving between them a t the comblnation with a casing, of low. vessels each serpentine channel rising from bottom to top, means for supplying the material to be freed from liquid or dried to the top of said casing, lscrapers adapted to reciprocate in the transverse direction over said vessels and to sweep oifin the longitudinal direction any precipitate ,or body, means for reciproeating means for discharging the diluted brine from the lowest of said vessels, and means for discharging the material dropping off the lowest vessel from said casing.

e HANS KAYSER.

Witnesses: .v

Emsaenrn: HELLMUTH, KATHARINA NAUOK.

said scrapers, troughs at the lower ends of the upper of said vessels, 'conveyers 

